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Guarantees (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011
Changes in Accrued Warranty [Abstract]
Balance at beginning of period	$ 6,727	$ 6,303	$ 6,801	$ 5,016
Warranty expense accruals	1,148	2,178	2,813	5,449
Warranty payments	(1,741)	(2,401)	(3,480)	(4,385)
Balance at end of period	$ 6,134	$ 6,080	$ 6,134	$ 6,080

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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